Grinding mill



July 3, 1928. 1,675,658

J. MURSCH GRINDING MILL Filed June 20, 1927 2 Sheets-$heei l N :BW

Ill '29 1 00000 k6 000000 g y 4 9 I 4& 1kg

so 36 17 M 27 .36

k7 [Fm E fi] fi' um v j I (I:

w a" l 18 naw atom July 3, 1928. 1,675,658

J. MURSCH GRINDING MILL Filed. June 20, 1927 2 Sheets-Sheet 2 W/AIIIIW g 13 attorneys Patented July 3, 1928.

UNITED STATES PATENT OFFICE.

I JOHN MURSCH, OF UTICA, NEW YORK, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, 'IO BUFFALO. HAMMER MILL CORPORATION, OF BUFFALO, NEW YORK, A

CORPORATION OF NEW YORK.

GRINDING MILL.

Application filed June 20,

My resent invention relates to a grinding mill 0 the type using rotating hammers.

The purpose of myinvention is to provide an improvement in the form, construction and operation of the grinding elements of the mill and also to provide an improved form of casing to enclose the grinding elements.

A' further purpose is to provide a grinding element where the hammer is of a form having several working faces and to provide means for definitely and positively holding the hammer so that the desired working face will be in operative position when the machine is in operation andwill stay in that relative position both during operation and during non-operation of the machine, but the hammer may be changed to a succeeding or any other position without taking the device apart. A further purpose is to provide especially convenient and effective means for producing such a step-by-step adjustment of the hammers in relation to therest of the grinding element.

Further purposes and advantages of my invention will appear from the specification and claims herein.

Fig. 1 is a vertical sectional view through a grinding mill embodying my invention.

Fig. 2 is a top View of the machine with the coverremoved, but showing only a few of the grinding elements in position.

Figs. 3 and 4 are side and edge views of the links.

Fig. 5 is a side View of one form of hammer that may be used.

FFig. 6 is a sectional view on line 66 of Figs. 7 and 8 are side and end views respectively of the pivot pin.

Figs. 9 and 10 are side and edge views respectively of the cam "disk.

Fig. 11 is a view of the cam disk with a pivot pin and ratchet plunger mounted therein.

Fig. 12 is a side view of one link with the hammer, cam disk and pivot pin assembled thereon.

Fig. 13 is a top view of the assembly shown in Fig. 12 with the addition of the second link of the pair.

Fig. 14 is a central longitudinal sectional view through a complete grinding unit in- 1927. Serial No. 200,125.

cluding the central rotating plate or plates. Fig. 15 is a view similar to Fig. 14 of a modified form of my invention.

Referring to the drawings in a more particular description the grinding mill comprises a box-like lower casing 20, a perforated or slotted screen 21, a cover 22, a

rotating shaft 23 mounted on bearings 24 supported on the casing and a series of grinding elements mounted on said shaft. Upon said shaft there are placed and fixed in spaced relation the desired number of circular plates 25 each having towards its edge a series of spaced and preferably aligned holes 26. Two of these plates spaced apart by an annular spacer 25 form the initial member of each grinding element. Upon each of these pairs of plates 25 at the desired positions as fixed by the holes 26 are secured the balance of the parts of each grinding element including two links 28. The perforated inner ends of this pair of links. are pivotally secured to the plate 25 by a through-rod 27. This rod in practice may. extend through the whole series of plates 25 so as to form the pivot for as many pairs of links 28 as are desired to be located at this position in the machine.

The links have aligned threaded holes 29 spaced back from their outer ends and adapted to engage and hold the threaded and preferably reduced opposite ends of the pivot pin 30 shown in Figs. 7 and 8. Upon the central smooth portion of this pivot pin there is revolubly mounted the circular cam disk 31 shown in Figs. 9 and 10. The hole 32 in this disk to receive the pivot pin 30 is"located eccentrically of the disk. In the portion of the disk away from the hole there is located a socket 33 extending in from the edge of the disk towards its center. In the outer end of the socket is placed the plunger 34 preferably having an inclined outer end as shown in Fig. 11 when held in its normal outward position by the coiled spring 35 v placed in the socket below the plunger. As the parts are seen in the drawings the incline upon the outer end of the plunger '34 slants from the lower side of the plunger as seen in Figs. 11 and 12 back towards and substantially into line with the eriphery of the cam disk at the upper side of the plunger.

Figs. 5 and 6 show one form of a multiple operating faced hammer 36 that may be used with my invention. I have shown the hammer as being hexagonal in outline but this is simply illustrative as any form of angular or plural faced hammer may be utilized with my invention. The essential feature of the hammer is that there shall be a central aperture 37 circular in outline and from the circular outline of this aperture the hammer is further cut away or formed with notches 38 extending outwardly from the aperture 37. These notches 38 correspond in number with the different operating faces of the hammer. The notches 38 and the socket 33* in the cam disk are so located relative to each other that when the ratchet plunger 34 is in extended position it will engage one of the notches 38 while one working face or edge of the hammer is in osition for work.

referably the plunger 34 is of the ratchet type as indicated in Fig. 11 and to co-operate therewith the notches '38 in the hammer 36 will be correspondingly shaped so as to provide shoulders 39 and cam faces 40 slanting back from the outer edge of the shoulder 39 to the circle of the opening 37.

With the parts arranged and assembled as shown in the drawings the rotating supporting plates 25 will be rotated anticlockwise as the machine is shown in Fig. 1. When the grinding elements are rotated it Wlll be obvious that the cam disks 31 will through centrifugal force in an obvious manner at once assume the relative position of the parts shown in Figs. 12,13 and 14; that 1s with the mass of the disk as far from its axis as possible. It will be understood also that the supporting links 28 will extend substantially radially from tlie plates 25.

The resistance the active grinding face meets in performing its work tends to rotate said hammer clockwise upon the cam disk 31 but such rotation in this direction is pre vented through the plunger 34 mounted in the disk having its exposed side engage a shoulder 39 of a notch 38. It will thus be seen that the hamrmar will continue in any position to which it is set relative to the cam disk and so in effect during working operation relative to the links 28 and that thisadjustment of the parts will not be dist-urbed'by successive stopping or starting of the machine. When it is desired, however, to turn a new grinding face to operative position the hammer can be readily rotated in an anticlockwise direction while the machine is at rest. This is done by the use of a special wrench or other tools whereby the cam disk is temporarily held stationary and the hammer rotated thereon bodil one or more steps as needed. During suc forced rotation of the hammer the sloping cam face 40 of the notch 38 engaging the plunger 34 operates to force said plunger .back into its recess against the tension of spring 34 until the next or any succeeding notch 38 is reached. It will be noticed particularly that this adjustment of a hammer can be made while the parts of the grinding element are still all assembled, that is without taking down the machine whatever. It will be seen also that individual adjustment can be made of each hammer so that one hammer may be advanced one step and the next hammer two or three steps if necessary. The spring plunger 34 co-operating with the notches in the hammer positively hold each hammer to the position to which it has been placed until that hammer is again positively adjusted or advanced to another position.

The box-like lower casing 20 may be conveniently and economically formed of two substantially similar cast or pressed metal sections 41 and 42. The section 41 provides one side 43 of the box and the section 42 provides the other side 44 of the box. Next to the flat sides 43 and 44 the sections 41 and 42 respectively are provided with a circular shoulder 45 to support the semi-circular screen 21. Beyond these shoulders 45 the sections 41 and 42 are spaced back from the screen providing the sloping edge portions 46 and 47 of the opposite edges of the box. The meeting edges of the sections 41 and 42 are provided with outwardly extending meeting flanges 48 which are held together by bolts 49 and nuts 50.

Fig. 15 shows a modified form of my invention in that the links 28 and pivot pins 30 are eliminated and the cam disks 31 each carrying a hammer 36 are mounted directly between two plates 25. The plates 25 are spaced farther apart as b a thicker spacer 25 mounted on the shaft 23. Preferably through rods 27 will extend through all of the series of pairs of plates 25" so that one rod 27 will hold in place upon the plates all of the grinding units that are placed opposite one set of holes in said supporting plates. The oam disks 31 in this construction are the same as heretofore described and each one carries a hammer 36 of the same type as heretofore described so that the hammers and cam disks will operate in the same manner as already detailed except that they are supported from the through rod 27'. The step by step adjustment between the hammer and the ratchet plunger upon the cam disk will be available as already described.

What I claim as new and desire to secure by Letters Patent is:

1. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, an intermediate member ecion links near their outer ends, a hammer having a plurality of grinding faces and revolubly mounted on said intermediate member, and means mounted on said intermediate member and engaging said hammer and adapted to positively hold said hammer relative to said intermediate member with any one of its grinding faces in radial alignment with the heavy side of said eccentrically mounted intermediate member whereby said desired face is yieldingly held in operative position.

2. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, an intermediate member mounted on said links near their outer ends, a hammer angular in outline and having a plurality of grinding faces and revolubly mounted on said intermediate member and yielding means adapted to positively hold said hammer with any one of its grinding faces in operative position, but allowing said hammer to be set to another position while the parts are assembled.

3. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, an intermediate member mounted on said links near their outer ends, a hammer angular in outline and having a plurality of grinding faces and revolubly mounted on said intermediate member and spring-tensioned means adapted to positively hold said hammer with any one of its grinding faces in operative position, but allowing said hammer to be set to another position while the parts are assembled.

4. A grinding unit for mills comprising a supporting member revolubly mounted, a-

pair of links pivotally connected to the sup- .porting member, an intermediate member mounted on said links near their outer ends. a hammer angular in outline and having a plurality of grinding faces and revolubly mounted on said intermediate member and ratchet means adapted to positively hold said hammer with any one of its grinding faces in operative position, but allowing said hammer to be set to another position while the parts are assembled.

5. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, a pivot pin connecting the outer ends of said links, a circular disk eccentrically and revolubly mounted flatwise between said pair of links on said pivot pin, a hammer having a plurality of grinding faces and revolubly mounted on said disk and means operatively interposed between said disk and said hammer and adapted to positively hold said hammer relative to said intermediate member with any one of its grinding faces in radial alignment with the heavy side of said intermediate member whereby said desired face is yieldingly held in operative position.

6. A grinding unitfor mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, a circular disk mounted flatwise between said pair of links near the outer end thereof, a hammer angular in out line and having a plurality of grinding faces and revolubly mounted on said disk and yielding means adapted to positively hold said hammer with any one of its grinding faces in operative position, but allowing said hammer to be set to another position while the parts are assembled.

7. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links ivotally connected to the supporting mem er, a circular disk mounted flatwise between said pair of links near the outer end thereof, a hammer angular in outline and having a plurality of grinding faces and revolubly mounted on said disk and spring-tensioned means adapted to positively hold said hammer with any one of its grinding faces in operative position, but allowing said hammer to be set to another position while the parts are assembled.

8. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, a circular disk mounted flatwise between said pair of links near the. outer end thereof, a hammer angular in out line and having a plurality of grinding faces and revolubly mounted on said disk and ratchet means adapted to positively hold said hammer with any one of its grinding faces in operative position, butallowing said hammer to be set to another position while the parts are assembled.

9. A grinding element for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, a circular disk mounted fiatwise between said pair of links near the outer end thereof, a hammer having a plurality of grinding faces and having a central aperture circular in outline but having ratchet toothed recesses extending out.- wardly therefrom whereby the hammer is revolubly mounted on said disk, and a ratchet member yieldingly mounted in said disk and having its projecting head slanted to engage said toothed recess-es so that the hammer may be rotated step by step one way but will be kept from rotation in the reverse direction.

10. A grinding element for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, a circular disk ing a plurality of grinding faces and hav ing a central aperture circular in outline but having ratchet toothed recesses extending outwardly therefrom whereby the hammer 5 is revolubly mounted on said disk, and a ratchet member yicldinglv mounted in said disk and having its projecting head slanted to engage said toothed recesses so that the hammer may be rotated step by step one way while the parts are assembled, but will be kept from rotation in the reverse direction.

11. A grinding element for mills comprising a supporting member revolubly 'mounted, a pair of links pivotally connected to the supporting member, a circular disk mounted fiatwise between said pair of links near the outer end thereof, a hammer having a plurality of grinding faces and having a central aperture circular in outline but having ratchet toothed recesses extending outwardly therefrom whereby the hammer is revolubly mounted on said disk, and a ratchet member yieldingly mounted in said disk and having its projecting head adapted to engage said toothed recesses so that the hammer may be purposely rotated step by step by retracting said ratchet member while theparts are assembled but the hammer will otherwise be held from rota tion on its disk.

12. A grinding unit for mills comprising revoluble supporting members, an intermediate member revolubly and ec-centrically mounted on said supporting members. a hammer having a plurality of grinding faces and revolubly mounted on said intermediate member and spring-tensioned means operatively interposed between said inter- 4 mediate member and said hammer and adapted to positively hold said hammer with any of its grinding faces in operative position but allowing said hammer to be set to another position while the parts are assembled.

13. A grinding unit for mills comprising rovoluble supporting members, an intermediate member revolubly and eccentrically connected to said supporting members, a

hammer angular in outline and havin a plurality of grinding faces and revolu ly mounted on said intermediate member and spring tensioned ratchet means interposed between saidintermediate member and said hammer and adapted to positively hold said hammer with any of its grinding faces in operative position but allowing said hammer to be set to another position while the parts are assembled.

14. A grinding unit for mills comprising spaced supporting members revolubly mounted, a pair of links pivotally connected to the supporting member, a pivot pin con necting the outer end of said links, and intermediate member revolubly and eccentrically mounted between said links on said pivot pin, a hammer having a plurality of grinding positions and revolubly mounted on said intermediate memberan means interposed between said intermediate member and said hammer and adaped to positively hold said hammer in any one of its grinding positions.

15. A grinding unit for mills comprising a supporting member revolubly mounted, a pair of links pivotally connected to the supporting member, a pivot pin connecting the outer end of said links, an intermediate member eccentrically and movably mounted between said links near their outer ends on said pivot pin, a hammer having a plurality of grinding faces and revolubly mounted on said intermediate member and means interposed between said intermediate member and said hammer and adapted to positively hold said hammer in a pre-determined position relative to said intermediate member.

16. In a grinding unit the combination of a hammer having a plurality of grinding positions, a member carrying said hammer and yielding means interposed between said supporting member and said hammer for adjustably setting said hammer to a predetermined grinding position.

17. In a grinding. unit the combination of a hammer having a plurality of grinding positions, a member carrying said hammer and ratchet means interposed between said supporting member and said hammer for adjustably setting said hammer to a 'predetermined grinding position.

In witness whereof I have aflixed my signature, this 3rd day of June, 1927.

JOHN MURSCH. 

